Cameras and an inspection team spotted the bat clinging to the side of Discovery?s 15-story external tank as it was being fueled with propellant ? super-cold liquid hydrogen and liquid oxygen.
The system runs on a green hydrogen peroxide propellant that leaves behind only water and oxygen, a solution not too far from the hydrogen peroxide in the common medicine cabinet.
系统使用只会产生水和氧气的过氧化氢环保推进剂，类似家庭常备医药箱里的过氧化氢溶液。
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The primary combustion of deficient oxygen solid propellant is non equilibrium because of its own physical and chemical processes.